Updated November 12, 2018 (but only Kaleidagraph). Also see free and open-source Mac statistics software
Apple’s Mac system updates have left certain software behind. This list is to make it easier to figure out whether statistics software is (a) ready for OS 10.15 and beyond, (b) Mojave-safe — that is, OK with OS 10.14, and (c) signed, so you won’t see a scary “unidentified developer” message like the one below. If we leave out information, it’s because we don’t know. If you are a developer or user and want to update this list, please let us know!
Acastat and Clarity: Mojave safe, 64-bit, signed
Easy Chi-Square Calculator: Mojave safe, 64-bit, signed
G*Power: Signed, 64-bit
InStat: Not 64-bit, not signed, not Mojave safe
Jamovi: 64-bit, signed
JASP: 64-bit, not signed, no mention of Mojave as of 10/19/18
JMP: 64-bit available, signed
Kaleidagraph: Unsigned. No information about 64-bit. Not updated since Mojave’s release.
MacAnova: not 64-bit, but it does appear to be signed. Mojave isn’t mentioned. Software itself notes no date after 2007.
PAST: Unsigned but 64-bit; have not tested on Mojave
PSPP: Unsigned if you download the binary; 64-bit safe if you compile the source code (not sure about the binary). No information about Mojave compatibility but it's probably OK if you build from source.
R (CRAN): Signed, 64-bit
Regress+: Unsigned but 64-bit; not tested on Mojave
SageMath: 64-bit. Have not tested for signing or Mojave (it's 3.5 GB); not listed on site.
SOFA: Unsigned but 64-bit
SPSS: 64-bit, signed, safe for Mojave with latest “Fixpack” (as of version 25)
Stata: 64-bit, signed, safe for Mojave
StatCalc (from Acastat): 64-bit, signed, Mojave compatible
Wizard: Mojave safe, 64-bit, signed